CN108879596B - A kind of leakage protection circuit with power supply monitoring function - Google Patents
A kind of leakage protection circuit with power supply monitoring function Download PDFInfo
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- CN108879596B CN108879596B CN201710321638.9A CN201710321638A CN108879596B CN 108879596 B CN108879596 B CN 108879596B CN 201710321638 A CN201710321638 A CN 201710321638A CN 108879596 B CN108879596 B CN 108879596B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/044—Checking correct functioning of protective arrangements, e.g. by simulating a fault
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A kind of leakage protection circuit with power supply monitoring function includes: leakage protection circuit, disconnects power load for monitoring the leak current fault in power supply line, and when leak current fault reaches at or above the earth leakage protective threshold value of setting；Electric source monitoring circuit, input terminal are connected to the output end of power circuit, for monitoring the power supply of leakage protection circuit, output action or alarm signal when monitoring the supply voltage of earth leakage protective control circuit lower than the threshold value set；Power circuit, input terminal are connected to phase line and middle line, and output end is connected to leakage protection circuit and electric source monitoring circuit, for providing power supply for leakage protection circuit.The present invention enables the failure of diode open-circuit in power circuit to be detected, improves the safety of leakage protection circuit by the voltage change on detection power circuit.
Description
Technical field
The present invention relates to a kind of leakage protection circuit more particularly to a kind of earth leakage protective electricity with power supply monitoring function
Road.
Background technique
In power supply system, in order to cope with load end due to the peace of the human electric shock of the initiations such as aging circuit, failure
Full problem usually requires the Aftercurrent protection circuit breaker that installation has creepage protection function in the node of access load.It is this
Breaker detects the vector sum of phase line current and current in middle wire to determine whether leak current fault occurs by zero sequence current mutual inductor.
When detecting threshold value of the leakage current greater than setting, the mechanical device tripping that breaker makes it internal disconnects the power supply of load,
The safety of the protection person and equipment.
In order to verify the working condition of Aftercurrent protection circuit breaker, it is fitted with testing button on breaker, by every
The moon presses a testing button and comes whether periodic detection breaker can normally thread off.But actually terminal user seldom periodically carries out
This detection.For this reason, it may be necessary to which whether the working condition that a kind of self-test method detects breaker automatically is normal.One kind is common certainly
Test method be it is silicon-controlled can not make breaker disconnect during generate analogue ground failure, so as to do not needing disconnect use
It is whether working properly that the components such as zero sequence current mutual inductor and leakage protection circuit in breaker are tested in the case where electric loading.Such as
It authorizes first half cycle of the patented technology of Publication No. CN102694364 in the period 1 of AC power supplies to start and extends to negative half
The period in period generates analogue ground failure, and detects response of the control circuit to simulation phase line grounding failure.Authorization is open
Number for CN102694364 patented technology then in negative half-cycle generate come analogue ground failure.To guarantee that breaker has enough
Energy work normally and driving buckle releaser, the electronic component in usual breaker are powered using full bridge rectifier.
When open-circuit fault occur in the part-diodes in full bridge rectifier, above-mentioned self-test scheme can not detect failure, even
The case where breaker can not thread off can not occur.This will cause security risk very serious.
As shown in Figure 1, earth leakage protective control circuit is powered by the full bridge rectifier that D0 ~ D3 is formed.Self-check control circuit
The collector of the base stage of connecting triode Q0, Q0 is connect by resistance R2 with middle line.In positive half period of the phase line relative to middle line
Interior, the voltage between middle line and the GND of rectifier output is 0.7V, if triode Q0 is connected during this period, in Q0 and R2 branch
The leakage current very little of upper generation can be neglected.In negative half-cycle, the voltage between middle line and the GND of rectifier output has
Valid value is 220V or 110V, if triode Q0 is connected during this period, biggish simulation electric leakage can be generated on Q0 and R2 branch road
Stream.Output action signal leads silicon-controlled Q1 after earth leakage protective control circuit detects the simulation leakage current in negative half-cycle
It is logical.But the other end for the tripping coil connecting with silicon-controlled anode is connect with phase line, and in negative half-cycle, phase line is defeated with rectifier
The voltage between GND out is 0.7V, and buckle releaser can not act.It is achieved in and does not carry out self-test in the case where turning off load.
When the diode either open in full bridge rectifier, safety issue is will be present in breaker.When such as D0 open circuit,
The supply access of phase line is disconnected in positive half period, and the supply access in negative half-cycle is intact, and full bridge rectifier becomes half
Wave rectification circuit.In this case, the power supply of earth leakage protective control circuit is gradually reduced in positive half period, in negative half-cycle
Restore normal.If generating simulation leak current fault in negative half-cycle carries out self-test, since power up is normal, self-test can not be sent out
The now failure.If but have normal electric leakage, when needing to thread off in positive half period, due to earth leakage protective in positive half period
The supply voltage of control circuit declines, and is output to the driving capability decline of Q1 control electrode.Especially under cryogenic, Ke Nengwu
Method drives the controlled stage of silicon-controlled Q1 to be allowed to be connected.Although there is electric leakage in this case, breaker can not thread off, therefore
There are security risks.
More serious situation is when there is the failure of D2 open circuit, and in positive half period, full bridge rectifier can not pass through
D2 returns to middle line.But in as shown in phantom in Figure 1, flowing back by reverse-biased triode Q0, R2 from the electric current that GND flows out
Line forms closed circuit.Since the operating current of earth leakage protective control circuit is generally 500uA or so, the size of resistance R2 is
10K Ω or so, therefore, although D2 opens a way in positive half period, the access formed by Q0 and R2 still can be earth leakage protective
Control circuit normal power supply.It can't see any abnormal phenomenon from power supply.Self-test is carried out in negative half-cycle can not also find
The failure.But when there is normal electric leakage to occur, although earth leakage protective control circuit can be such that Q1 is connected, on tripping coil
Electric current need the access formed by Q0 and R2 to return to middle line and form closed circuit to flow through due to the metering function of R2 resistance
The electric current of tripping coil is only tens milliamperes, which can not be such that buckle releaser acts, and breaker can not disconnect load.Breaker function
It can fail, but self-test control circuit can not find failure and issue alarm signal.It can be seen that there are serious for existing scheme
Security risk.
Summary of the invention
The present invention provides a kind of leakage protection circuit with power supply monitoring function, can detecte power failure, improves
Safety.
In order to achieve the above object, the present invention provides a kind of leakage protection circuit with power supply monitoring function, includes:
Leakage protection circuit is set for monitoring the leak current fault in power supply line, and when leak current fault reaches at or above
Power load is disconnected when fixed earth leakage protective threshold value；
Electric source monitoring circuit, input terminal are connected to the output end of power circuit, for monitoring the electricity of leakage protection circuit
Source, output action or alarm signal when monitoring the supply voltage of earth leakage protective control circuit lower than the threshold value set；
Power circuit, input terminal are connected to phase line and middle line, and output end is connected to leakage protection circuit and power supply monitoring
Circuit, for providing power supply for leakage protection circuit.
The leakage protection circuit includes:
Zero sequence current mutual inductor is set in phase line and middle line, for incuding leak current fault；
Earth leakage protective control circuit, input terminal connects zero sequence current mutual inductor, for detecting the ground connection in power supply line
Failure, the output action signal when the leak current fault electric current in power supply line is greater than given threshold；
Buckle releaser driving circuit, for receiving at least one action signal, and output drive signal drives de- to buckle releaser
It detains device and disconnects power load, and/or issue alarm signal.
Buckle releaser, input terminal is connected to the output end of buckle releaser driving circuit, for disconnecting power load and supply lines
The connection on road.
The power circuit uses full-wave rectifying circuit.
The electric source monitoring circuit includes:
Sample circuit connects power circuit, for sampling the output voltage of power circuit by a certain percentage；Sampling electricity
Road includes concatenated first divider resistance and the second divider resistance；
Comparator, electrode input end connect the output signal of sample circuit, and negative input connects reference voltage, the ratio
It is used to judge whether the output voltage of power circuit is lower than operation voltage threshold value compared with device；Reference voltage and the first divider resistance and
The intrinsic standoff ratio of two divider resistances determines operation voltage threshold value jointly；
The output signal of low-pass filter, input terminal connection comparator avoids threading off for filtering out the burr on power supply
Device malfunctions；
The output end of pulse-detecting circuit, input terminal connection low-pass filter prevents malfunction for detecting pulse signal
Make；Pulse-detecting circuit receives after at least one low level pulse signal of input terminal output action pulse and broadens electricity to pulse
Road；
Pulse expansion circuit, input terminal connect the output end of pulse-detecting circuit, and output end connects buckle releaser driving electricity
Road input terminal, for broadening pulse signal for wide pulse signal, guarantee turn-off module reliably working.
The buckle releaser driving circuit includes:
Diode, anode are connected to the output end of earth leakage protective control circuit, and negative terminal is connected to silicon-controlled controlled stage；
Diode, anode are connected to the output end of electric source monitoring circuit, and negative terminal is connected to silicon-controlled controlled stage；
Silicon-controlled, anode is connected to buckle releaser, when the voltage between its controlled stage and cathode exceeds silicon-controlled triggering
When voltage, controlled silicon conducting.
The buckle releaser includes:
Tripping coil is connected between the output end and phase line of tripping driving circuit, for drive needed for generating tripping
Power；
First contact switch, is connected between phase line and power load, in the effect for the driving force that tripping coil generates
The lower connection for disconnecting power load and phase line；
Second contact switch, is connected between middle line and power load, in the effect for the driving force that tripping coil generates
The lower connection for disconnecting power load and middle line.
The leakage protection circuit with power supply monitoring function also includes: self-detection module, for testing leakage automatically
The working condition of electric protection circuit, when failures are detected output action signal.
The self-detection module includes: self-test control circuit, triode, diode and resistance, self-test control electricity
Road is separately connected the base stage of phase line and triode, the cathode of the collector connection diode of triode, and the emitter of triode connects
Ground connects middle line after the anode series resistance of diode.
The self-detection module includes: self-test control circuit, second it is silicon-controlled and and resistance, self-test control circuit
It is separately connected phase line and the second silicon-controlled control electrode, connects middle line after the second silicon-controlled anode series resistance.
The present invention enables the failure of diode open-circuit in power circuit by the voltage change on detection power circuit
It is detected, improves the safety of leakage protection circuit.
Detailed description of the invention
Fig. 1 is the common earth leakage protective control circuit schematic diagram with self-checking function.
Fig. 2 is the circuit diagram of the first embodiment of the present invention.
Fig. 3 is the schematic diagram of internal structure of electric source monitoring circuit.
Fig. 4 is the waveform diagram of each node in electric source monitoring circuit when diode open-circuit failure occurs.
Fig. 5 is second embodiment of the present invention schematic diagram.
Fig. 6 is third embodiment of the present invention schematic diagram.
Specific embodiment
Below according to Fig. 2~Fig. 6, presently preferred embodiments of the present invention is illustrated.
As shown in Fig. 2, a kind of leakage protection circuit with power supply monitoring function is provided in the first embodiment of the present invention,
Include:
Leakage protection circuit 1 is set for monitoring the leak current fault in power supply line, and when leak current fault reaches at or above
Power load 4 is disconnected when fixed earth leakage protective threshold value；
Electric source monitoring circuit 3, input terminal are connected to the output end of power circuit 2, for monitoring leakage protection circuit 1
Power supply, output action or alarm signal when monitoring the supply voltage of earth leakage protective control circuit 1 lower than the threshold value set；
Power circuit 2, input terminal are connected to phase line and middle line, and output end is connected to leakage protection circuit 1 and power supply prison
Slowdown monitoring circuit 3, for providing power supply for leakage protection circuit 1.
The leakage protection circuit 1 includes:
Zero sequence current mutual inductor 101, is set in phase line and middle line, for incuding leak current fault；
Earth leakage protective control circuit 102, input terminal connects zero sequence current mutual inductor 101, for detecting power supply line
Ground fault, when the leak current fault electric current in power supply line be greater than given threshold when output action signal；
Buckle releaser driving circuit 103, for receiving at least one action signal, and output drive signal is to buckle releaser 104,
It drives buckle releaser to disconnect power load 4, and/or issues alarm signal.
Buckle releaser 104, input terminal are connected to the output end of buckle releaser driving circuit 103, for disconnect power load and
The connection of power supply line.
As shown in Fig. 2, in the present embodiment, the power circuit 2 uses full-wave rectifying circuit 4.
As shown in figure 3, the electric source monitoring circuit 3 includes:
Sample circuit 201 connects power circuit 2, for sampling the output voltage of power circuit 2 according to a certain percentage；
In the present embodiment, which includes concatenated first divider resistance RS0 and the second divider resistance RS1；
Comparator 202, electrode input end connect the output signal VS of sample circuit 201, negative input connection reference
Voltage VREF, the comparator 202 is for judging whether the output voltage of power circuit is lower than operation voltage threshold value；Reference voltage
The intrinsic standoff ratio of VREF and the first divider resistance RS0 and the second divider resistance RS1 determines the operation voltage threshold value jointly, in this implementation
In example, operation voltage threshold value is set as 3V；
Low-pass filter 203, input terminal connects the output signal VO of comparator 202, for filtering out the burr on power supply,
Buckle releaser is avoided to malfunction；In the present embodiment, low-pass filter 203 uses analog filter or digital filter；When adopting
When with analog filter, which can be placed on after sample circuit 201, before comparator 202.
Pulse-detecting circuit 204, input terminal connect the output end VLPF of low-pass filter 203, for detecting pulse letter
Number, it prevents from malfunctioning；Pulse-detecting circuit 204 receives output action arteries and veins after at least one low level pulse signal of input terminal
PWRFL is rushed to stretch circuit 205, to prevent from malfunctioning, in the present embodiment pulse-detecting circuit 204 detect four it is low
Output action pulse signal is to stretch circuit 205 after level pulse；
Pulse expansion circuit 205, input terminal connect the output end of pulse-detecting circuit 204, and output end connects buckle releaser
103 input terminal of driving circuit, for broadening pulse signal for wide pulse signal, guarantee turn-off module reliably working；Pulse exhibition
After stretch circuit 205 receives the pulse signal of the PWRFL of the sending of pulse-detecting circuit 204, broadened as at least one power frequency
The wide pulse signal in period, to guarantee that buckle releaser driving circuit 103 reliably acts, the pulse width broadened in the present embodiment
For the time width of 1.5 power frequency periods.
As shown in Fig. 2, the buckle releaser driving circuit 103 includes:
Diode D5, anode are connected to the output end of earth leakage protective control circuit 1, and negative terminal is connected to the control of silicon-controlled Q1
Grade processed；
Diode D6, anode are connected to the output end of electric source monitoring circuit 3, and negative terminal is connected to the control of silicon-controlled Q1
Grade；
Silicon-controlled Q1, anode are connected to buckle releaser 104, when the voltage between its controlled stage and cathode exceed it is silicon-controlled
When trigger voltage, controlled silicon conducting；
The diode D6 can use light emitting diode, can be while electric source monitoring circuit defeated 3 goes out action signal
Issue alarm signal.D6 is the D6 when open circuit occurs for D2 so that buckle releaser can not thread off using the usefulness of light emitting diode
Alarm signal prompt buckle releaser can be still issued to break down.
As shown in Fig. 2, the buckle releaser 104 includes:
Tripping coil L0 is connected between the output end and phase line of tripping driving circuit 103, for generating needed for tripping
Driving force；
First contact switch K1, is connected between phase line and power load 4, in the driving force that tripping coil L0 is generated
The lower connection for disconnecting power load and phase line of effect；
Second contact switch K2, is connected between middle line and power load 4, in the driving force that tripping coil L0 is generated
The lower connection for disconnecting power load and middle line of effect；
As shown in figure 4, for diode open-circuit failure occurs, when full bridge rectifier being caused to become Half bridge rectifier, power supply prison
The waveform diagram of each node in slowdown monitoring circuit 3.In half period of the phase line relative to middle line, due to there is no supply access, leak
The supply voltage VDD of electric protection control circuit 102 is gradually reduced, when close to positive half period end point, in electric source monitoring circuit 3
Comparator 202 detect low supply voltage and export low level pulse signal VO, low-pass filter 203 output by filtering
Later low level pulse signal VLPF, when the 4th low level pulse VLPF occurs, the confirmation electric leakage of pulse-detecting circuit 204
The power failure of control circuit 102 is protected, PWRFL pulse signal is exported, stretch circuit 205 believes PWRFL pulse
Number broadening is wide pulse signal TRGPW that width is 1.5 power frequency periods, when which can ensure that tripping coil L0 has enough
Between driving breaker acted in positive half period.If open-circuit fault occurs for the D2 in full bridge rectifier, due in positive half period
The interior current path that can not form center line, thus while silicon-controlled Q1 can be connected, but due to electricity no on tripping coil L0
Stream, tripping coil can not act, and can issue alarm by being connected on the light emitting diode D6 of the control electrode of silicon-controlled Q1 at this time
Signal.
As shown in figure 5, a kind of leakage protection circuit provided in the second embodiment of the present invention, in the base of first embodiment
It include also self-detection module on plinth, for testing the working condition of leakage protection circuit automatically, output is dynamic when failures are detected
Make signal.The self-detection module includes: self-test control circuit 105, triode Q0, diode D7 and resistance R2, self-test observing and controlling
Circuit 105 processed is separately connected the base stage of phase line and triode Q0, the cathode of the collector connection diode D7 of triode Q0, three poles
The emitter of pipe Q0 is grounded, and connects middle line after the anode series resistance R2 of diode D7.
The increase diode D7 on the simulated failure current path of triode Q0 and resistance R2, two in power circuit 2
When pole pipe D2 opens a way, due to diode D5 reverse bias, ground GND can not be formed to the circuit of middle line, full bridge rectifier becomes
Half-wave rectifying circuit, the power supply decline of earth leakage protective control circuit 102, electric source monitoring circuit 3 detect this in positive half period
Output action signal after failure, light emitting diode D6 issue alarm signal.
As shown in fig. 6, a kind of leakage protection circuit is provided in the third embodiment of the present invention, on the basis of first embodiment
On also include self-detection module, which includes: self-test control circuit 105, the second silicon-controlled Q3 and with resistance R2,
Self-test control circuit 105 is separately connected the control electrode of phase line and the second silicon-controlled Q3, the anode series electrical of the second silicon-controlled Q3
Middle line is connected after resistance R2.
It is different from the third embodiment, triode Q0 and diode D7 is changed to the second silicon-controlled Q3 in the present embodiment,
When the diode D2 open circuit in power circuit 6, the second silicon-controlled Q3 can equally block reversed logical from ground GND to middle line
Road, full bridge rectifier become half-wave rectifying circuit, and electric source monitoring circuit 3 detects output action signal after the failure, shine
Diode D6 issues alarm signal.
It should be noted that the power supply of self-test control circuit 105 is used independently of electric leakage in embodiment listed by the present invention
Protect the power supply mode of control circuit 102.Self-test control circuit 105 and earth leakage protective control circuit can also be used in practice
The confession that 102 shared full-wave rectifying circuits or even the power supply of self-test control circuit 105 and earth leakage protective control circuit 102 are shorted
Electric mode.
It should be noted that the output of power sense circuit directly passes through diode D6 and drives in embodiment listed by the present invention
Move silicon-controlled, this is a kind of safer mode.In some applications, the output of power sense circuit can be directly driven
Light emitting diode or buzzer issue alarm signal.
In practical applications, electric source monitoring circuit 3 can integrate with self-test control circuit 105 together with become it is dedicated
IC chip.
The present invention enables the failure of diode open-circuit in power circuit by the voltage change on detection power circuit
It is detected, improves the safety of leakage protection circuit.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (7)
1. a kind of leakage protection circuit with power supply monitoring function, characterized by comprising:
Leakage protection circuit (1), for monitoring the leak current fault in power supply line, and when leak current fault reaches at or above setting
Earth leakage protective threshold value when disconnect power load (4)；
Electric source monitoring circuit (3), input terminal are connected to the output end of power circuit (2), for monitoring leakage protection circuit (1)
Power supply, output action or alarm signal when monitoring the threshold value of the supply voltage of earth leakage protective control circuit (1) lower than setting
Number；
Power circuit (2), input terminal are connected to phase line and middle line, and output end is connected to leakage protection circuit (1) and power supply prison
Slowdown monitoring circuit (3), for providing power supply for leakage protection circuit (1)；The power circuit (2) uses full-wave rectifying circuit (4)；
The electric source monitoring circuit (3) includes:
Sample circuit (201) connects power circuit (2), is used for the output voltage of proportional sampling power circuit (2)；This is adopted
Sample circuit (201) includes concatenated first divider resistance (RS0) and the second divider resistance (RS1)；
Comparator (202), electrode input end connect the output signal (VS) of sample circuit (201), negative input connection ginseng
Voltage (VREF) is examined, the comparator (202) is for judging whether the output voltage of power circuit is lower than operation voltage threshold value；With reference to
The intrinsic standoff ratio of voltage (VREF) and the first divider resistance (RS0) and the second divider resistance (RS1) determine operation voltage threshold value jointly；
Low-pass filter (203), input terminal connects the output signal (VO) of comparator (202), for filtering out the hair on power supply
Thorn, avoids buckle releaser from malfunctioning；
Pulse-detecting circuit (204), input terminal connects the output end (VLPF) of low-pass filter (203), for detecting pulse
Signal prevents from malfunctioning；Pulse-detecting circuit (204) receive export after at least one low level pulse signal of input terminal it is dynamic
Make pulse (PWRFL) to stretch circuit (205)；
Pulse expansion circuit (205), input terminal connect the output end of pulse-detecting circuit (204), and output end connects buckle releaser
Driving circuit (103) input terminal, for broadening pulse signal for wide pulse signal, guarantee turn-off module reliably working.
2. as described in claim 1 with the leakage protection circuit of power supply monitoring function, which is characterized in that the earth leakage protective
Circuit (1) includes:
Zero sequence current mutual inductor (101), is set in phase line and middle line, for incuding leak current fault；
Earth leakage protective control circuit (102), input terminal connects zero sequence current mutual inductor (101), for detecting power supply line
Ground fault, when the leak current fault electric current in power supply line be greater than given threshold when output action signal；
Buckle releaser driving circuit (103), for receiving at least one action signal, and output drive signal is to buckle releaser (104),
It drives buckle releaser to disconnect power load (4), and/or issues alarm signal；
Buckle releaser (104), input terminal are connected to the output end of buckle releaser driving circuit (103), for disconnect power load and
The connection of power supply line.
3. as claimed in claim 2 with the leakage protection circuit of power supply monitoring function, which is characterized in that the buckle releaser
Driving circuit (103) includes:
First diode (D5), anode are connected to the output end of earth leakage protective control circuit (1), and negative terminal is connected to silicon-controlled
(Q1) controlled stage；
Second diode (D6), anode are connected to the output end of electric source monitoring circuit (3), and negative terminal is connected to silicon-controlled (Q1)
Controlled stage；
Silicon-controlled (Q1), anode are connected to buckle releaser (104), when the voltage between its controlled stage and cathode exceed it is silicon-controlled
When trigger voltage, controlled silicon conducting.
4. as claimed in claim 3 with the leakage protection circuit of power supply monitoring function, which is characterized in that the buckle releaser
(104) include:
Tripping coil (L0) is connected between the output end and phase line of tripping driving circuit (103), for generating needed for tripping
Driving force；
First contact switch (K1) is connected between phase line and power load (4), in the driving force that tripping coil (L0) is generated
Under the action of disconnect power load and phase line connection；
Second contact switch (K2) is connected between middle line and power load (4), in the driving force that tripping coil (L0) is generated
Under the action of disconnect power load and middle line connection.
5. the leakage protection circuit with power supply monitoring function as described in any one of claim 1-4, which is characterized in that
The leakage protection circuit with power supply monitoring function also includes: self-detection module, for testing earth leakage protective electricity automatically
The working condition on road, when failures are detected output action signal.
6. as claimed in claim 5 with the leakage protection circuit of power supply monitoring function, which is characterized in that the self-test
Module includes: self-test control circuit (105), triode (Q0), third diode (D7) and resistance (R2), self-test control
Circuit (105) is separately connected the base stage of phase line and triode (Q0), and the collector of triode (Q0) connects third diode (D7)
Cathode, the emitter ground connection of triode (Q0), the anode series resistance (R2) of third diode (D7) connects middle line afterwards.
7. as claimed in claim 5 with the leakage protection circuit of power supply monitoring function, which is characterized in that the self-test
Module includes: self-test control circuit (105), second silicon-controlled (Q3) and resistance (R2), and self-test control circuit (105) is respectively
The control electrode of phase line and second silicon-controlled (Q3) is connected, the anode series resistance (R2) of second silicon-controlled (Q3) connects middle line afterwards.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710321638.9A CN108879596B (en) | 2017-05-09 | 2017-05-09 | A kind of leakage protection circuit with power supply monitoring function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710321638.9A CN108879596B (en) | 2017-05-09 | 2017-05-09 | A kind of leakage protection circuit with power supply monitoring function |
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| Publication Number | Publication Date |
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| CN108879596A CN108879596A (en) | 2018-11-23 |
| CN108879596B true CN108879596B (en) | 2019-11-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111474422B (en) * | 2019-01-24 | 2023-03-28 | 上海复旦微电子集团股份有限公司 | Ground fault protection system |
| CN111864694B (en) * | 2019-04-30 | 2022-09-27 | 上海复旦微电子集团股份有限公司 | Residual current protection circuit |
| CN111864691B (en) | 2019-04-30 | 2023-04-28 | 上海复旦微电子集团股份有限公司 | Ground fault protection circuit |
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| CN108879596A (en) | 2018-11-23 |
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